Carburetor



June 12, 1928. 1,673,306

F. 0. BALL CARBURETOR Filed June 14, 1923 2 SheetsSheet l June 12, 1928.

F. O. BALL CARBURETOR Filed June 14, 1925 2 Sheets-Sheet 2 m 1 M M w 1 m1 a M M 0 a M w M a M 1 w M M w Patented June 12, 1928.

UNITED STATES PATENT OFFICE.

FREDERICK 0. BALL, OF DETROIT, MICHIGAN, ASSIGNOR TO BALL AND BALL CAR-BURETOR COMPANY, A PARTNERSHIP COMPOSED OF FREDERICK 0. BALL ANDCORNELIA M. BALL, F DETROIT, MICHIGAN.

CARBURETOR.

Application filed June 14, 1923. Serial No. 645,304.

Differences in temperature conditions and qualities of fuel make itdesirable to provide carburetors with some simple and readily operablemeans by which the richness of the mixture may be varied. It has beencommon, therefore, to provide carburetors with choke valves which whenclosed increase the suction eifort on the fuel delivering passages sothat very much more fuel may be delivered with a given portion of air.The ordinary choke valves are faulty, however, in that the functioningof the carburetor is never the same so that while the carburetor may bedelivering the desired quality of mixture throughout a very large partof, or all its range with the choke valve open the quality of themixture does not retain the proper mixture with the variable velocitiesthrough the carburetor incident to changing engine speed. As a resultthe engine only functions well, or with approximately a desirablemixture at about one speed where the choke as ordinarily formed isbrought into use. The present invention is 26 designed to correct thisfault and to provide the carburetor with a choking mechanism which willassure a, proper functioning of the carburetor through quite a range ofspeed with the choke in operation. Other features of the invention willappear from the specification and claims.

The invenflon is illustrated in the accompanying drawings as followsFig. 1 shows a central section through a carburetor showing theconstruction of choke.

Fig. 2 a side elevation of the portion of the carburetor showing thechoke lever mechanism.

Fig. 3 a view of the choke in idling position.

Fig. 4 a view of the choke in full running position with the choke inoperation.

Fig. 5 a view with the choke open.

Fig. 6 a horizontal section of the inlet passage showing the choke valvein plan view.

1 marks the body of the carburetor, 2 the Venturi tube, 3 the mixingchamber, 4 the throttle valve, 5 the float chamber, 6 the floatoperating in the float chamber, 7 the float lever, 8 the float leverbracket, 9 the float valve stem on which the lever operates, 10 a floatvalve, and 11 the inlet to the fioat chamber. The fuel passes by. anopening 12 to an annular passage 13'and passes from that through radialopenings 17 in a closure plug 16 to a tube 14 which reaches upwardly foran idling passage and to a passage 18 leading to a well 19. The fuelpasses from the well through openings 20 and 21 to a spray nozzle 22;The tube 14 terminates in an opening 23 in the body leading by way of apassage 24 to the suction passage at a point opposite the edge of thethrottle valve when closed. This is what is .ordinarily termed theidling passage, the air for spraying the fuel being delivered through anopening 13 and'an opening 14 in the tube 14. These parts so far asillustrated may be of any desired construction.

A choke valve 25 is arranged at the inlet end of the carburetorextending into the carburetor shown in a horizontal direction and atright angles to the mixing chamber, or passage leading to the mixingchamber. This inlet passage is of a size ordinarily so that when thechoker valve opens there is no restriction as compared to the Venturitube in this part of the passage. The choke valve is loosely mounted ona pin 26 which extends through the walls of the passage. A lever 27 hasasplit end and is clamped on the pin 26 by means of a screw 28. Anoperating wire 29 is secured in the lever by means of a screw 30. Thewire extends through a guide passage 31 and the guide passage is lockedb means of a screw 32 in a mounting 33. This guide wire extends in theusual manner to an operating button in the dash (not shown) and isactuated at the dash in the usual manner of actuating a choke except fora slight variation hereinafter mentioned.

The choke valve has an opening 34 extending through it and this openingis closed by blades 35 and 35*, the blades having rearward extendingprojections 36 through which screws 37 extend securing these auxiliaryvalv plates on the choker valve. An actuating rocker arm 38 is locked bymeans of a screw 39 on the pin 26. It is provided with an engaging end40 which operates against the valve 35 to close the same when the pin 26is rocked to the extreme in the closing direction. The rocker 38 has theengaging end 41 which contacts the choker valve and limits the openingmovement of the valve 35.

The valve 35 which may be termed the auxiliary valve controlling theidling condition has a restricted opening 35, this opening having anarea designed to give just the right mixture for idling. The plate 35 isslightly curved when released so that when secured by the screws 37 thevalve is held in closed position with a very slight tension. The plate35 is curved in the opposite direction so as to open when relieved ofpressure exerted by the engaging end 40.

In the operation of the device when a full choke condition is desired soas to draw in a mass of fuel for starting conditions the choke isentirely closed by drawing the rocker to its extreme position (as shownin Fig. 1) closing the plate 35*. As soon as this condition is passedthe Choker operating means on the wire 29 is slightly relieved and thespring action of the valve 35 will swing this valve to a positionbringing the rocker end 41 into engagement with the choke valve plate.The parts under these conditions assume the position shown in Fig. 3.This will give a desired opening for idling speed and also will takecare of the turning over of the engine. In starting the engine, however,as the engine speeds up thus exerting suction effort on the choke valvethe idling auxiliary valve immediately opens, thus bringing the parts tothe position shown in Fig. 4. The opening 34 acting with the yieldingvalve will follow up to give the desired quality of rich mixturethroughout the range of ordinary running speeds so that the engine willperform while warming up or during excessively cold weather normallywith the choke in its closed position giving a complete range of speedswith a properly proportioned mixture.

What I claim as new is 1. In a carburetor, the combination of a suctionpassage; means delivering fuel thereto; and a choke valve at the inletside of the fuel delivery comprising two springactuated auxiliary valvesacting successively and controlling valve 0 enings of different area,said auxiliary va ves being actuated with the choke valve andindependently responsive to suction effort automatically varying thechoking action of the choke valve.

2. In a carburetor, the combination of a suction passage; meansdelivering fuel thereto; and a choke valve at the inlet side of the fueldelivery comprising two springactuated auxiliary valves actingsuccessively and controlling valve openings of different area, one valveopening having a capacity for deliverin air for idling, said auxiliaryvalves being actuated with the choke valve and independently responsiveto suction effort automatically varying the choking action of the chokevalve.

3. In a carburetor, the combination of a suction passage; meansdelivering fuel thereto; and a choke valve at the inlet side of the fueldelivery comprising two spring-actuated auxiliary valves actingsuccessively and controlling valve openings of different area, saidvalves overlying each other, said auxiliary valves being actuated withthe choke valve and independently responsive to suction effortautomatically varying the choking action of the choke valve.

4. In a carburetor, the combination of a suction passa e; meansdelivering fuel thereto; and a choke valve at the inlet side of the fueldelivery comprising two spring-actuated auxiliary valves actingsuccessively and controlling valve openings of different area, saidvalves overlying each other, and one valve opening having a capacity fordelivering air for idling, said auxiliary valves being actuated with thechoke valve and independently responsive to suction effort automatically varying the choking action of the choke valve.

5. In a carburetor, the combination of a suction passage; meansdelivering fuel thereto; and a choke valve at the inlet side of the fueldelivery comprising two spring-actuated auxiliary valves actingsuccessively and controlling valve openings of different area, saidvalves being in the form of spring plates overlying each other, one ofsaid lates having a smaller valve opening, sai auxiliary va ves beingactuated with the choke valve and independently responsive to suctionoffort automatcally varying the choking action of the choke valve.

6. In a carburetor, the combination of a suction passage; meansdelivering fuel thereto; a swinging choke valve at the inlet side of thefuel delivering means comprising a main valve and a double auxiliaryvalve mounted on the main valve controlling openings of different areas,said auxiliary valves being in the form of spring plates, one platebeing superposed upon the other; and a rocker acting on said plates andhaving limited movement controlling said plates inde endently of thechoke valve.

In a carburetor, the combination of a suction passage; means deliveringfuel thereto; a swinging choke valve at the inlet side of the fueldelivery, said choke valve having an auxiliary valve openingtherethrough and comprising a main valve and a double auxiliary valvemounted on the main valve, said auxiliary valve being in the form ofspring the choke valve operating the choke valve 1 plates arranged overthe opening in the choke and the auxiliary valves, said rocker havingvalve, said plates being superposed and the a movement relatively to thechoke valve to plate next the opening normally closing on permit thecontrolling of the auxiliary valves the opening in the choke valve andhaving a independently of the choke valve. restricted openingtherethrough, the plate In t stimony whereof I have hereunto set 15 overthe restricted opening being under tenmy hand. o

sion to assume an open position when released; and a rocker swingingrelatively to FREDERICK O. BALLo

